[sdiy] Evelope Follower

[Dr Strangelove]

Well, I wanted to do bass, guitar, and my drum machine.
Do you know what kind of envelope follower the Mooger Fooger uses?  I was 
happy with the way it sounded (although it sometimes would freek out on a 
decaying chord and move up and down very erratically)

         -=<Jonathan Pratt>=-
       (Phdinfunk at hotmail.com)




>From: harry <harrybissell at prodigy.net>
>To: Tim Escobedo <tpe123 at yahoo.com>
>CC: Dr Strangelove <phdinfunk at hotmail.com>, synth-diy at dropmix.xs4all.nl
>Subject: Re: [sdiy] Evelope Follower
>Date: Wed, 15 Aug 2001 20:49:06 -0400
>
>One very important point of "envelope follower" is...
>
>what do you want it to follow ?
>
>For guitar use, I prefer a peak detector circuit to a rectifier / filter
>circuit.
>The peak detect has a fast rise time and slow decay....
>
>The trade is between acceptable response time, and acceptable ripple
>in the output. For guitar and bass, by the time you reduce ripple
>(causes harmonic and IM distortion in units driven by the CV...) you have
>killed the response time.  Can't win...
>
>H^) harry
>
>
>
>Tim Escobedo wrote:
>
> > In-Reply-To: <F32a4k3z6QEy0Dll7fn000082dd at hotmail.com>
> > MIME-Version: 1.0
> > Content-Type: text/plain; charset=us-ascii
> >
> > The easiest envelope follower circuits can probably be found in guitar
> > pedals. These generally involve tapping into the original signal,
> > amplifying it, rectifying it, and filtering it. The result is a DC
> > voltage proportional to the level of the original signal. It's
> > particularly effective with dynamic signals like those from electric
> > guitar. With a rather static signal, whose envelope characteristics are
> > more on/off, the envelope follower may be less effective unless
> > preceded by a EG/VCA, or some kind of "attack" control is built in to
> > the env follower.
> >
> > http://www.muzique.com/schem/quack.gif has a simple example of an
> > envelope follower (IC1a).
> >
> > --- Dr Strangelove <phdinfunk at hotmail.com> wrote:
> > > Hi, I've been working away trying to build a little mono-synth but
> > > the next
> > > semester is nearly upon me so I'm revising my plans.  I've got a
> > > working
> > > filter I've built that I like a lot and I like the way all sorts of
> > > sounds
> > > work with it.  I am wanting to place the filter in a crybaby wah-wah
> > > housing
> > > and have the cutoff under foot control, I also want to have an
> > > envelope
> > > follower in there too with variable control voltage sent to the
> > > filter
> > > cutoff.  I'll place the knobs for input level, Envelope follower
> > > control and
> > > resonance on the top of the crybaby.  It should be lots of fun.
> > >
> > > I cannot find a schematic for an envelope follower.  Can anyone
> > > direct me to
> > > a good envelope follower schematic, preferably a simple one?  I'm
> > > using +/-
> > > 12v power. :-)
> > >
> > >          -=<Jonathan Pratt>=-
> > >        (Phdinfunk at hotmail.com)
> > >
> > >
> > >
> > >
> > >
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